Boost read_xml issue parsing string?

Question

I'm trying to parse this string and retrieve the "sid" and the "Type". I have the following code. It is crashing at the get_child line and I'm not entirely sure why...

const boost::property_tree::ptree& empty_ptree(){
static boost::property_tree::ptree t;
return t;
}

int _tmain(int argc, _TCHAR* argv[])
{
struct SXMLElements
{
    std::string strSessionId;
    unsigned int uiTypeOfNotification;
};

std::string strXMLText = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\r\n" 
"<NotificationSet vers=\"1.0\" svcid=\"session\" notid=\"42\">\r\n" "<Notification><![CDATA[<SessionNotification vers=\"1.0\" notid=\"42\">\r\n"
"<Session sid=\"sdfkljdsfkjjsf\">\r\n" "<Property name=\"CharSet\" value=\"UTF-8\"></Property>\r\n" 
"</Session>\r\n" "<Type>5</Type>\r\n" 
"<Time>324242</Time>\r\n" 
"</SessionNotification>]]></Notification>\r\n" 
"</NotificationSet>";

//// Parse the HTTP header Status line.
std::stringstream ss( strXMLText );

boost::property_tree::ptree xmlResponse;
//if (strXMLText.size() > 0)
//{
std::istringstream isResponse (strXMLText);
boost::property_tree::read_xml(isResponse, xmlResponse);
SXMLElements sXmlElem;
//const boost::property_tree::ptree & formats = xmlResponse.get_child("NotificationSet.Notification.Session", empty_ptree());
BOOST_FOREACH( boost::property_tree::ptree::value_type const& v, xmlResponse.get_child("NotificationSet.Notification.SessionNotification.Session") )
{
    sXmlElem.strSessionId = xmlResponse.get<std::string>("<xmlattr>.sid", "");
    sXmlElem.uiTypeOfNotification = xmlResponse.get<unsigned int>("Type", 0);
    //  }
}
//}

return 0;
}

Can anyone spot what I might be doing wrong?

Hehe. To the edit, I also provided the answer :)

sehe
– sehe

2015-05-08 22:47:32 +00:00
Commented May 8, 2015 at 22:47 — sehe
– sehe, Commented May 8, 2015 at 22:47

Community · Accepted Answer · 2017-05-23 11:58:44Z

0

The Session attribute cd=""\"o=rrs,o=ces,maxtime=""\"64""\" decodes to

cd="o=rrs,o=ces,maxtime="64"

which leaves invalid XML.

Regardless, all the ""\" could be replaced by just \"

Besides that, a simple test revealed that Boost Property Tree doesn't like <![CDATA[]]> sections, and rightly so: What does <![CDATA[]]> in XML mean?

In an XML document or external parsed entity, a CDATA section is a section of element content that is marked for the parser to interpret as only character data, not markup. wikipedia

SUMMARY

Boost Property Tree is not an XML parsing library (xml parsing using boost)
CDATA segments are not XML (so even using an XML library you shouldn't expect to parse it directly)

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#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <iostream>

int main()
{
    std::string const strXMLText = R"(<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
    <NotificationSet vers="1.0" svcid="session" notid="42">
        <Notification><SessionNotification vers="1.0" notid="42">
                <Session sid="sdfkljdsfkjjsf" stype="user" cid="uid=1,u=People,dc=r,dc=c" cd="o=rrs,o=ces,maxtime=64" maxidle="24">
                    <Property name="CharSet" value="UTF-8"></Property>
                    <Property name="ed" value="xxx"></Property>
                    <Property name="Sdle" value="sdl:asdadsad"></Property>
                </Session>
                <Type>5</Type>
                <Time>324242</Time>
        </SessionNotification></Notification>
    </NotificationSet>
    )";

    //// Parse the HTTP header Status line.
    std::stringstream ss(strXMLText);

    boost::property_tree::ptree xmlResponse;

    std::istringstream isResponse (strXMLText);
    boost::property_tree::read_xml(isResponse, xmlResponse);

    if (auto SessionNotification = xmlResponse.get_child_optional("NotificationSet.Notification.SessionNotification"))
    {
        struct SessionElement {
            std::string id;
            unsigned int uiTypeOfNotification;
        };

        if (auto Session = SessionNotification->get_child_optional("Session")) {
            SessionElement elem {
                Session->get("<xmlattr>.sid", ""),
                SessionNotification->get("Type", 0u)
            };

            std::cout << "id: " << elem.id << ", type: " << elem.uiTypeOfNotification << "\n";
        }
    }
}

Prints

id: sdfkljdsfkjjsf, type: 5

edited May 23, 2017 at 11:58

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answered May 8, 2015 at 22:08

sehe

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11 Comments

Suzan Aydın Over a year ago

std::string strXMLText = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\r\n" "<NotificationSet vers=\"1.0\" svcid=\"session\" notid=\"42\">\r\n" "<Notification><![CDATA[<SessionNotification vers=\"1.0\" notid=\"42\">\r\n" "<Session sid=\"sdfkljdsfkjjsf\">\r\n" "<Property name=\"CharSet\" value=\"UTF-8\"></Property>\r\n" "</Session>\r\n" "<Type>5</Type>\r\n" "<Time>324242</Time>\r\n" "</SessionNotification>]]></Notification>\r\n" "</NotificationSet>";

Suzan Aydın Over a year ago

That's what I have now Sehe, but i'm getting an exception still being thrown in the "xmlResponse.get_child("NotificationSet.Notification.SessionNotification.Session")" part.....

Suzan Aydın Over a year ago

Because of the CDATA, does that mean i can't use Boost Property Tree? What else could i use?

sehe Over a year ago

Please, @suzan, update your question. Comments don't work for this - at all. I've updated my answer

Suzan Aydın Over a year ago

Thanks @sehe, i've updated my code. The xml i initially had with the CDATA was from a demo HTTP POST request with content set to xml. Are you saying that when i receive the POST request with the xml content, that the CDATA won't be in there?

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